About the Image DPI Checker
Print shops often ask for “300 DPI images”. DPI is just a number stored in the file telling software how large to print the pixels; what really matters is the pixel count. This checker reads the stored resolution from JFIF, EXIF or PNG pHYs data and shows how large the image will print at 72, 150, 300 and 600 DPI.
For PNG files you can also write a new DPI value without touching a single pixel.
How to use it
- Drop a JPG or PNG image.
- Read the stored DPI and calculated print sizes.
- Optionally set a new DPI for PNG files and download.
Good to know
- Changing the DPI value does not make an image sharper. To print larger at 300 DPI you need more pixels.
- Some apps ignore stored DPI entirely and use their own defaults (often 72 or 96).